DE1226408B - Device for continuous leaching or washing of pulp - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

D31c

German class: 55 b - 5/10

Number: 1226 408

File number: A 37079IV a / 55 b

Filing date: March 28, 1961

Opening day: October 6, 1966

The invention relates to a device for the continuous leaching or washing of cellulose pulp with a cylindrical upright container, which the pulp fed at the bottom of the same the height and passes sieve bodies and is discharged in the upper end.

In the known devices of the above design, the sieve surfaces are either parallel to the cross section the pulp flow or at the bottom of the container below the pulp flow. In the Practice has now shown that such devices do not ensure uniform screening capital. The object of the invention is therefore to provide the known devices for continuous To improve the leaching or washing of pulp pulp in such a way that one as possible uniform screening takes place over the entire cross-section of the container and intensive separation of liquid is assured.

According to the invention, this object is achieved in that in a known device of the above Design of the container is provided with a radial partition that extends over at least one Extends part of its length, and the strainer body is formed so that it connects at the bottom of the partition and approximately the shape of a circular sector-shaped disc, which at right angles to a shaft located axially in the container is seated so that it swivels alternately into each container half can be. In the case of the invention, the screen body lies transversely in the pulp flow and acts with it entire cross-section to the current permitted in each case. It is obvious that here the flow pressure is not deflected, so that it promotes the separation of liquid. During the screening The pulp column of one half of the container can be on the other side of the partition Pulp can be fed unhindered. Switching can be done regularly to the two Treat halves evenly. With the invention, therefore, a very uniform screening takes place pulp, for the purpose of removing certain liquids from the pulp, for example of digestion liquor.

According to a particularly expedient development of the invention, in the lower end of the container Funnels sit next to each other, the lower ends of which each form an inlet for the pulp, the The upper ends of the funnels open out into the container on both sides of the partition. The screen body can thereby be arranged directly above the upper funnel ends and level with the lower edge of the partition.

Device for continuous leaching or washing of pulp pulp

Applicant:

Aktiebolaget Kamyr, Karlstad (Sweden)

Representative:

Dr.-Ing. E. Maier, patent attorney, Munich 22, Widenmayerstr. 5

Named as inventor:

Johan Christoffer Fredrik Carl Richter, St. Jean Cap Ferrat, Alpes Martimes (France)

Claimed priority:
Sweden of March 28, 1960 (3056), of July 8, 1960 (6681)

Further features, advantages and details of the invention emerge from the description of the Drawing and the claims. In the drawing, an embodiment of the invention is for example shown, namely shows

F i g. 1 shows a longitudinal section along the broken plane II of FIG. 2,

F i g. FIG. 2 shows a cross section along the plane II-II from FIG Fig. L

F i g. 3 shows a longitudinal section along the plane HI-III of FIGS. 2 and

F i g. 4 a modified detail.

In the drawings, 11 denotes a standing container with a cylindrical shell, which is with an upper and a lower dome-shaped end is connected and terminated, the one Form cover 13 or a base 15. The pulp passes through the container from bottom to top, the pulp slurry continuously or in small batches through a feed line 17, which is fed to, for example, the outlet end of a continuous digester or a Pulp bleach tower can be connected. The container is flat in its longitudinal direction Divided partition 19, which is attached to the shell of the container and is located in an axial plane. The partition wall extends upwards, almost to the lid 13. In the lower end part of the container four funnels 21, 23, 25 and 27 are used, which extend with their lower neck 29, 31, 33, and 35 through

ί 226 4Ö8

3 4

Extend the bottom of the container and extend it sterile at the top. OSr Wf | § dnä äärief äü6H mit

expand. of the discharge line 67 in Y | er'BiH'äung. The ones with opening

Each hopper end with an upper opening has a wall 73 * May be flat, but is the shape of a quarter circle. The curved Kan- preferably as shown in the drawings with th of the openings lie against the mantle of the 5 Kinship §1 ;. §3 au's | el31iäSt, close up from hers and are preferably connected to this surface area that is connected to the shaft den while its radial! straight edges ahein- 51 are. These ribs can either be three on one another abut and preferably with one another, .längs eeklgeil püefscfinitt, like the rib 81, and horizontal lines 36, 37, 39 and 4Ϊ (Fig. 2), the two opposite directions taper with each other a Kfe'dz picture, connected euhu. io lowing frustoconical surfaces, which with-

The edges 37, 41 are approximately opposite one another along an upper semicircular edge of the horizontal lower edge 42 of the wall 19 are connected, or are arranged in a rectangular cross-section, but from this by a small gap, such as the rib 83, which through two opposing space separated The funnels can be made of thin set cylindrical surfaces, which be sheet metal. So that they are not exposed to too great a load of different diameters and a flat connection, the defree space 43 can have between the dung surface, which is at a higher position than you and the body of the container; to which the parts of the upper wall of the sieve body should have access to the pulp pulp, with the net, which lies between the ribs; The other containers should also be combined in order to avoid the pressure of other fjords of the rib. The surfaces' of the equalize, or this space may have liquid- 20 ribs are perforated. Can be filled by height and tightness, so that no larger.volume-spaced ribs can.that changes can take place. The necks of the sieve surface of the sieve body .. in comparison to a funnel are all connected to the pulp feed line for the upper wall of the sieve basket in a large manner. In the arrangement shown, subjects are enlarged. The edge 77 un9 'which the necks 29 and 31 directly, with a common 25 ends' the ripper! They are preferably tapered in order to facilitate the turning of the body 45 and the necks 33 and 35.
The position shown in the drawing, is connected to a further common line 47. The tubes 45 and 47 are in turn connected to the SiebkÖrpef vessels above the funnel 2i and 2 ^ line 17; At the junction it is arranged that these are prevented from being covered

2i or the funnels 25, 27 with the line Ϊ7 _, the space above the funnels 25 ·, 27

are bound, with the switching periodically fully staridi'g left free, so that the; ZellstöffbM; the

can be made; -Therefore, while flowing "through" line 17, haeli is passed up and

a certain time interval the pulp of 35 evenly 'through' the funnel over half of the

one half of the cross section of the container fed; Container can be distributed, see on the tebh-

and after switching the valve 49 can this th page in Fig. 1 and -2 is located.

Half are switched off and the pulp pulp instead of After swiveling the SieblcÖfpers around one

• its 'the other half of Ues container supplied angle Void -180 ° by rotating' the shaft 51

Will. 40 If the funnels 25, 27 are now covered, during the

Between the funnels, cell pulp extends equiaxially through the funnel 23, M exits. As

to the container a hollow shaft 51, the upper end of which "shows the line 85," becomes the movement ties _a ventiis 4.9

is stored in a bearing 53, which is supplied by the funnel through its connection with the motor 57

ö'd'er thifch "a spider is held, what last rivet, so d'a'ß the valve at the same time as the toggle

res the radial connecting lines between these 45 tang ^{f of} the screen body between 'its two' positioners

reinforced. The shaft 51 extends' through the gene switched wiPd. The LMe 87 igt also the

Bottom 15 of the container and is assigned to this by moving the valve ^r 67, with .dem target,

a stuffing box 55 aBge'dicntet. The wave becomes' the Auslafileituhg '65 during the switchover process

by an electric motor 57 via a gear 59 ^ closing.

driven. With the help of a ' ^{stuffing box r} 63, which 50 ΐπί lower edge' of the vertical and extending radially

• the while unigibt and has radial bores, -erStre'efeeMen Wan'd® are AüSäeh & iühgen 89, 9l

stands'the central bore "61 äer shaft with egg fest- yorg'es'eheh," their. Form of the FÖ in the radial

• SteÜen'deh drain line 65 in connection, in which cuts through the ribs 81 respectively. 83 corresponds to this

■ a controllable. Valve 67 is located. Limitations of the observations are adjacent

Immediately over half of the TirichteröfFnuhgeh "and 55 'of the ribs, sb that they, When the Siebkörger yeif-

üh'erhälb the 'radial wall 19 is a sieve body is swung, "ate scraper for the removal of

'69 is attached, which is attached to the shaft 51 and fiber ribbons are used as much as possible in the

₅ M 'of the weighing unit level "can be swiveled. This SfeBofftfiihgen get stuck ^ ..

Siebkofper has almost the shape of a circular sec- At the upper end of xles B'ehalters sittd means, vbr-

i-shaped hollow disc, which is located in the horizontal 60, preferably in the form of SpPiihrhöfen 93.95 for you

A lower wall 71 extends on the th level to the supply of washing liquid, for example Mnes

Know, furthermore an upper hat Üffriun'gen Versailles And waters bder Fil'trkt, vdrpseheÄ ·, Has aül; a 'föl-

Wall 73 serving as a sieve, 'a Umbilgskarite 75, agenda laundry filter exits Wnd the "through a line

which is & ahe'the IM side of the container sewing b'e- tuhg57 in regular beer, quantity "is supplied. Γη

finds, and a straight side edge 77, 'the dia- 65' of this line is 'a three-way valve ' ^ eihgese ^ zt,

Metral back container extends and with its ends with the help of the washing liquid either 'through

with the ends 'of the crimped side edge 75 ver' das Spiühröhr ^: 93 or through the spray pipe 95,.

is bound, Def Raüni 79 can be guided inside the sieve body. The line 1Ö1 shows erne su

1 <22§

g the setting of the VeMiIs 99 for the pivoting movement of the sieve body and for other setting parts; 'by which is achieved; that washing liquid is supplied to half of the container in which the screen body is currently located, in which the pulp is at rest, while the other spray tube, which is located above the half to which the pulp is supplied, is closed; 103 M denotes a timing relay which sends pulses to all the above-mentioned setting elements ib and controls them at certain intervals, for example a few minutes.

A positive pressure can be maintained in the container by means of compressed air which is supplied through line 105. For discharging the pulp from the container at its upper end, two horizontal screw conveyors 107 and 109 are provided, which are arranged parallel to one another and to the wall 19 and the ends of which extend into a discharge chamber 111 on the side of the container. In this chamber, the pulp is diluted with water supplied through line 113 and the diluted pulp is discharged through a pulp outlet pipe 115 which is connected to the funnel-shaped bottom of the chamber and into which a control valve 117 is inserted. This valve, which is controlled with the aid of a mirror regulator 119 , which receives its impulses from the mirror 121 of the pulp in the discharge chamber 111 , controls the discharge in such a way that the overpressure in the container is maintained.

In the case of the in FIG. In the modified embodiment shown in FIG. 4, no dilution of the pulp takes place in the discharge chamber 111. Instead, the chamber is connected to a screw press 123 in which a plug is provided which is sufficiently rigid to withstand the pressure difference which exists across it when the external pressure in the discharge line 115 is maintained.

As can be seen from the above, the lye is sieved off during operation of the system, and washing is done alternately in one and the other half of the container. In In the position shown, the strainer body is in the left half of the container, which is in operation. The pulp in it is at rest, and its area is below the Working area of the screw conveyor 107, which can be switched off. Wash water is through the Spray tube 93 is inserted and forms a layer on the pulp, whereby it spreads evenly over the Cellulose pulp column spreads and penetrates this downwards, with a corresponding volume of the Liquid is displaced which contains a high percentage of digestion liquor. The liquid is located located directly above the sieve body 69 and has full lye strength, which through the sieve holes into the Inside the screen body is displaced and through the space under the wall 19 and through the bore 61 and the line 65 exits therethrough. The latter can be sent to a plant for the recovery of the Heat content and the chemicals of the waste liquor.

During this time, no washing process takes place in the right half of the container, the spray tube 95 is switched off and no displaced caustic solution is provided. The pulp slurry is conveyed into this half, whereby it flows steadily in the line 17 and continues unhindered from the funnels 25, 27 through the container further upwards. Aiii upper end of the movable Zellstöffbreisäule, AEIE to a higher level than the column of the other half rises, enters the Fördersehhecke 109 in activity and promotes the chamber ill a lot of washed pulp, which corresponds to the amount of laugenhältigen Zellstbffbreis which simultaneously deni floors of Container is supplied.

After the time interval set by the time relay 103 has elapsed, an automatic switchover takes place in order to now carry out a washing process in the right half of the container and to feed another batch of pulp to the left half. In addition to resetting the valves 49 and 99, a rotary movement of the screen body through an angle of 180 ° around its axis is brought about with the aid of a motor 57 , which comes to a standstill automatically when the movement is completed. Then the pointed straight edge 77 of the sieve body cuts into the right pulp column and covers the funnels 25, 27 with their full lower wall 71, while the sieve body is simultaneously pulled out of the left pulp column so that the pulp pulp out of the funnels 23, 21 can. The washing can now take place in the right half in the same way as before in the left half, and the pulp can be fed into the left half. This sequence of operations will be repeated periodically with regular switches between washing the pulp which is at a standstill and supplying the pulp without washing, these switchings being able to take place at suitable intervals without an excessive amount of pulp being supplied between the successive washing periods. In the feed and discharge lines which are common to the two container halves, the feed and discharge of the pulp and the washing liquid and the waste liquor are essentially continuous.

Claims (5)

Patent claims: 1. Device for continuous leaching or washing of pulp with a cylindrical standing container, the height of the pulp slurry fed in at the bottom of the same and passes through sieve bodies and is discharged in the upper end thereof, characterized in that that the container (11) is provided with a radial partition (19) which extends over at least part of its length, and the screen body (69) at the bottom of the Partition wall (19) adjoins it and has approximately the shape of a disk in the shape of a sector of a circle, which sits at a right angle on a shaft (51) axially located in the container, so that it can be pivoted alternately into each container sector. 2. Apparatus according to claim 1, characterized in that in the lower end of the container (11) funnels (21, 23, 25, 27) sit next to each other, their lower ends (31, 33, 35, 37) each form an inlet for the pulp, the upper ends of the funnels on both sides of the The partition (19) opens out in the container (11). 3. Apparatus according to claim 1 and 2, characterized in that the screen body (69) immediately above the upper ends of the funnel and at the level of the lower edge of the partition (42) is arranged. 4. Apparatus according to claim 1 to 3, characterized in that the perforated cover of the screen body (69) carries a number of ribs (81, 83) or similar upwardly projecting projections concentric to the shaft (51). 5. Apparatus according to claim 4, characterized in that the lower edge of the partition (19) is provided with recesses (89, 91), the shape of which corresponds to the profile of the ribs (81, 83) or protrusions. Considered publications:
German Auslegeschriften R14330IV a / 55 b (published on August 9, 1956); J8558VII / 55C (announced December 6, 1956). 1 sheet of drawings